Drill-cylinder.



G. G. HANSEN. DRILL CYLINDER.

APPLICATION FILED JAN. 10, 1910. 1,093,408.

Patented Apr. 14, 1914,

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CHARLES C. HANSEN, 0F EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-BAND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

DRILL-CYLINDER.

Specification of Letters Patent.

Patented Apr. 1 1, 1914.

Application filed January 10, 1910. Serial No. 537,240.

To all whom it may concern:

Be it known that I, CHARLES C. HANSEN, a citizen of the United States, and resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Drill-Cylinders, of which the following is a specification.

This invention relates to rock drills with the object in view of providing the cylinder of the drill with a removable lining, whereby the lining may be renewed when worn out by the reciprocation of the piston, without having to renew the entire cylinder.

Another object is to provide a skeleton cylinder comprising front, back and intermediate cross rings, longitudinally arranged feed guides extending from the front to the back ends of the cylinder and connecting said rings, a valve chest seat and port extensions connecting the seat with the said front and back rings, all of said parts being preferably cast integral and forming an efficient housing and protector for the removable cylinder lining.

A further object is to provide a cylinder made of the material which is best suited to withstand the rough usage to which a rock drill is commonly put, while providing the lining of the cylinder of the best kind of material for withstanding constant frictional wear.

A still further object is to provide certain improvements in the form, construction and arrangement of the various parts, whereby the above named objects may be very effectively carried out.

A practical embodiment of my invention is represented in the accompanying drawings in which,

Figure 1 represents a top; plan view of the drill cylinder, Fig. 2 represents a section taken in the plane of the line AA ofFig. 1, looking in the direction of the arrows, Fig. 3 represents a section through the parts shown in Fig. 1, taken in the plane of the line B--B of Fig. 2, looking in the direction of the arrows. Fig. 4 represents a side elevation of the drill cylinder with the front head and back head. removed. Fig. 5 repre seats a side view of the bushing 0r cylinder lining, and Fig. 6 represents a top view of the same.

The cylinder is denoted by 1, and is provided with a front head 2, and back head 3 held in place therein by the through bolts 4:. The cylinder is shown as being of spider or skeleton construction.

The valve chest is denoted by 5, and is removably secured to the cylinder by bolts 6 and nuts 6*. Interposed between the valve chest 5 and the cylinder 1, is the plate 7 pro' vided with an inwardly extending portion 8 which carries the arc-shaped slide valve 9. This valve 9 is carried in such a position that some part of it always extends into the cylinder 1. A spring-pressed plunger 10 is provided for holding the valve 9 firmly on to its seat. A main inlet 11 serves to admit the motive fluid to the valve chest, but inasmuch as the particular arrangement of valves and ports and the particular operation of the valves is no part of this invention, they will not be further described.

The piston is denoted by 12, and is provided with a front extension 13 for carrying a drill bit chuck, not shown. A rifle bar 141 is arranged for engagement with a nut within the piston 12, for giving the piston 12, and hence the extension 13, an intermittent rotary movement in one direction. This rifle bar 14 is provided with a head within the slip ring 15, which head engages with a rotation device within said ring 15, for permitting the rifle bar l i to rotate in one direction and holding it against rotation in the opposite direction. A washer 16 is inserted between the slip ring 15 and an annular shoulder 17 in the cylinder 1. A spring 18 and cross bar 19, together with the through bolts 4-, hold the back head 3, slip ring 15- and washer 16 in position within the cylinder, with the washer 16 abutting against the shoulder 17. p

A removable bushing 20 is mounted in the cylinder 1, and acts as a lining for thesaid cylinder, within which the piston 12 reciprocates. This bushing or cylinder lining 20 may be made of any material which is suitable for withstanding frictional wear and which provides a good surface for contact with the reciprocating piston 12. The cylinder 1 may be made of a material which is best suited to withstand hard usage. The bushing or lining 20 abuts at its forward end against an annular shoulder 21 within the cylinder 1, and at its rear end against the washer 16. It is thus held in place within the cylinder by the spring 18, cross bar 19 and through bolts 4, which parts hold the back head 3, ring 15 and washer 16 in place as above set forth. The bushing or lining 20 is provided with an opening 22 which is fitted to register with a valve port in the cylinder, and with an opening 23 through which the slide valve 9 projects into the interior of the cylinder 1.

It will be seen that by removing the through bolts 4:, the cross bar 19 and spring 18 may be released from their engagement with the back head 3, and the said back head, ring 15, washer 16 and rifle bar 1 1 may be removed from the cylinder 1 through the back thereof. The nuts 6* may be unscrewed several turns, thus permitting the valve chest 5, plate 7 and projection 8 to be separated laterally a short distance from the cylinder 1. This lateral movement of the projection 8 will serve to remove the valve 9 from its position projecting into the cylinder 1. The way is now clear for the bushing or cylinder lining 20 to be removed from the cylinder 1 by simply sliding it out through the back end of the cylinder. Thus it is only necessary, practically, to loosen six bolts or nuts in order to remove the old lining from a ylinder and put a new lining or bushing therein.

The skeleton drill cylinder 1 comprises a front cross ring 27 for receiving the front head, a back cross ring 28 for receiving the back head, intermediate cross rings 29, longitudinally arranged side feed guides 2l extending from the front to the back of the cylinder and connecting the said rings at the face of the cylinder, a valve chest seat 26 and valve port extensions 25, 25*, connecting the valve chest seat 26 to the front and back cross rings 27, 28, alongthe top ofthe cylinder. The parts forming the skeleton cylinder are preferably cast integral. This arrangement of the parts serves to provide a protecting frame for the removable lining 20, shielding the lining from many hard blows which would otherwise be inflicted upon it when the drill is in use, which blows because of the comparative frailty of the lining, would be liable to injure it so as to make replacement of the lining necessary, Furthermore, the disposition of the feed guides 24 upon opposite sides of the cylinder at the base thereof and the disposition of the valve chest seat and port extensions along the top of the cylinder serves to give the cylinder very considerable strength and: at the same time permits the cylinder to be made in skeleton form and extremely light.

The provision. of a removable bushingor cylinder lining in this case is doubly valuable for the reason that it not only permits the quick repair of the tool; by the replace ment of that part which is most rapidly worn in use, bu,t it also permits the cylinder comprising front and back cross to be made in skeleton form as described, for the reason that if any injury does come to the lining 20 from the fact that the cylinder is of skeleton construction, the lining may be very quickly and readily replaced by a new one.

Not only do I provide a very simple and effective means for changing the lining of the cylinder, but, by making the lining which forms the bore of the cylinder separate from the remainder of the cylinder, I provide other very important advantages, such as permitting the cylinder to be made in skeleton form and hence lighter and less expensive, and also permitting the cylinder to be made of the material which is most suitable for the work to which the cylinder is to be subjected, while permitting the bore of the cylinder or lining to be made of the material which is most suitable for the wear which comes upon that part.

It is to be understood that various changes may be resorted to in the form, construction and arrangement of the different parts of this device, without departing from the spirit and scope of my invention, hence I do not Wish to limit myself strictly to the form herein shown and described, but

What I claim is:

1. A rock drill cylinder of skeleton form, its front and back heads, through bolts holding the front and back heads in place and a removable lining for the cylinder interposed between the front and back heads, said skeleton c lindercom risin cross rin s embrac-' y s e ing the lining, longitudinally arranged feed guides rigidly connecting the cross rlngs along the base of the cylinder and a valve chest seat and its port extensions rigidly connecting the said rings along the top of the said cylinder, said cross rings, feed guides, valve chest seat and, port extensions being all formed integral.

2. A rock drill cylinder of skeleton form, its front and back heads, through bolts hold ing the front and back heads in place and a removable lining for the cylinder interposed between the front and back heads, said skeleton cylinder comprising front, back and intermediate cross rings embracing the lining, longitudinally arranged feed guides rigidly connecting the rings; at the base of the cylinderand a valve chest seat and its portextensions rigidly connecting the front, back and intermediate cross rings along the top of the cylinder, said cross rings, feed guides, valve chest; seat and port extensions being all formed integral,

3.v A rock drill cylinder of skeleton form rings, longitudinally arranged feed guides connecting the front and back, rings, a valve chest seat and, port extensions. connecting the seatwith the front and back rings, said crossrings, feedguides, valve chest seat and port extensions being all formed integral, said front as my invention, I have signed my name in ring being provided With an interior shoulpresence of two Witnesses, this fifth day of der, front and back heads, through bolts January, 1910.

holding them in position, and a removable CHARLES C. HANSEN. 5 lining for the cylinder interposed between Witnesses:

said shoulder and back head. WM. O. MORRIS,

In testimony, that I claim the foregoing HARRY D. PoWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

